<div class="nav">
    <div class="Navigation">
        <ul class="ul1">
            {volist name="nav" id="vo"}
            <li class="li1"><a href="{$vo.url}">{$vo.name}</a>
                {notempty name="vo.childrens"}
                <ul class="ul2 {eq name='vo.url' value='/szpd'} channel_header {/eq}">
                    {volist name="vo.childrens" id="v"}
                    <li class="li2"><a href="{$v.url}">{$v.name}</a></li>
                    {/volist}
                </ul>
                {/notempty}
            </li>
            {/volist}
        </ul>
    </div>
</div>